The Jetboil Sumo Companion Cup is a decent 1.8 litre cup that can be locked onto the available range of Jetboil's stoves. Sumo stows a 100 gm or 230 gm can of fuel and burner base with room to spare, or a complete Sol or Zip system with 100 gm fuel. It is also capable of stowing a 450 gram fuel canister.